Answer:
graph one
Step-by-step explanation:
Let
x ----> the number of visit per month
y ----> the total cost
we know that
Observing the table
1) For the interval of x equal to ----> [0,12] (close circle both points)
The domain is all whole numbers greater than or equal to 0 visits and less than or equal to 12 visits
The value of y is
y=5x+15
For x=0 ----> y=$15
For x=12 ----> y=5(12)+15=$75
The range is the interval ----> [15,75] (close circle both points)
All real numbers greater than or equal to $15 and less than or equal to $75
2) For the interval of x equal to ---->(12,16] (open circle at left and close circle at right)
The domain is all whole numbers greater than 12 visits and less than or equal to 16 visits
The value of y is
y=4x+32
For x=12 ----> y=4(12)+32=$80
For x=16 ----> y=4(16)+32=$96
The range is the interval ----> (80,96] (open circle at left and close circle at right)
All real numbers greater than $80 and less than or equal to $96
3) For the interval of x equal to ---->(16,24] (open circle at left and close circle at right)
The domain is all whole numbers greater than 16 visits and less than or equal to 24 visits
The value of y is
y=3x+42
For x=16 ----> y=3(16)+42=$90
For x=24 ----> y=3(24)+42=$114
The range is the interval ----> (90,114] (open circle at left and close circle at right)
All real numbers greater than $90 and less than or equal to $114
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